Which brand of diapers do you recommend which is cheap and good? Where to get them?

NTUC has lots of promotions and I realise that different NTUC has different pricings for different locations. We pick up our diapers from NTUC at Tanjong Pagar plaza, which seems to be the most economical so far. I have heard good reviews of goon and petpet from my mum friends with regards to Low cost diapers. Personally we are still experimenting. I have bought MamyPoko (like it, good for bowel movements, but cutting a little small), Huggies, pampers and Merries.